Air powered angle and bar guillotine



y 1955 E. G. TELFER 3,195,387

AIR POWERED ANGLE AND BAR GUILLOTINE Filed April 4, 1962 2 Sheets-Sheet 1 '5 I I L4: \i Q II no 20, 6 E. G. TELFER 3,195,387

AIR POWERED ANGLE AND BAR GUILLOTINE Filed April 4, 1962 2 Sheets-Sheet} 3,195,387 AIR PDWERED ANGLE AND BAR GUILLOTINE Edward G. Telfer, Monash, South Australia, Australia Filed Apr. 4, 1952, Ser. No. 185,143 Claims priority, application Australia, Apr. 7, 1961, 3,386/61 4 Claims. (Cl. 83-395) This invention relates to an air powered guillotine for cutting angles and bars.

The usual guillotine which is suitable for cutting angles and bars consists of a motor driven machine tool employing a heavy flywheel and clutch and utilises the inertia of the flywheel to drive a moving guillotine blade pasta fixed guillotine blade to sever the metal. Such an arrangement, however, is of considerable cost, and one of the objects of this invention is to provide a guillotine which can be produced for much lower cost.

When guillotines make use of yokes a certain amount of movement is frequently imparted to the arms of a yoke, and this movement can have the effect of wearing the blade-cutting edges, and it is a further object of this invention to provide an air powered guillotine wherein the conventional yoke is dispensed with.

In its simplest form the invention may be said to includes a frame, a lower longitudinal member on the frame, a pair of spaced front forks extending upwardly from the front end of the lower longitudinal member, a pair of spaced rear forks extending upwardly from the rear end of the lower longitudinal member, a blade arm hinged at its rear end between the rear forks and guided near its front between the front forks, a lever arm above the blade arm and hinged near its front end between the forks, links between the front ends of the lever and blade arms, a trunnion mountedair cylinder between the frame and the rear end of the lever arm operable to move the lever arm about its pivot and thereby move the blade arm about the blade arm pivot, guillotine blade-retaining means on the blade arm, and co-operating guillotine blade retaining means on the lower longitudinal member.

With this arrangement, it is possible for a stop to be secured to an arm depending from the lever arm between the lever arm and the front forks, whereby the stop lifts away from the end of a work piece being cut and so prevents any danger of the work piece fouling the guillotine arms.

An embodiment of the invention is described hereunder in some detail with reference to and is illustrated in the accompanying drawings in which:

FIG. 1 is a righthand side elevation of a guillotine,

FIG. 2 is a lefthand side elevation of same,

FIG. 3 is a section on lines 3-3 of FIG. 2, and

FIG. 4 is a fragmentary section showing the air cushion valve of the air cylinder.

According to this embodiment, a frame it) comprises a lower longitudinal frame member 11, a pair of spaced parallel front forks 12 welded near the front end of the frame member 11, and a pair of rear forks, 13 welded near the rear end of the frame member 1-1, the forks being substantially parallel and extending upwardly. The lower frame member 11 has a rear frame extension 14 and a front transverse foot 15 whereby it may be bolted to a supporting frame or table (not shown).

A lever arm 1% is hinged about a hinge pin 19 in the top of the front forks 12, the lever arm 18 passing right through the front forks 12 and extending forwardly thereof. The rear end of the lever arm 18 is pivotally connected to the piston rod 20 of an air cylinder 21 which is trunnion mounted on a pin 22 extending be- United States Patent 0 3,i95,38.7 Patented July 20, 1965 tween the members comprising the rear frame exten= sion 14.

A blade arm 25 is hinged at its rear end on a pin 26 and between the rear forks 13, the blade arm 25 extend ing forwardly between the front forks 12. A pair of links '27 pivotally interconnect the front ends of the lever arm 18 and blade arm 25, whereby upward movement of the piston rod 2th moves the lever arm 18 about its mounting pin 19 and thereby moves the blade arm 25 downwardly about its mounting pin 26.

The blade arm 25 has an upper clamping plate 30 to which both a moving bar guillotine blade 31 for the cutting of flat bar stock, and also the moving angle guillotine blade 32 for the cutting of angel stock are secured. The guillotine blades are secured by the headed bolts 33, the heads 34 of which are recessed into the respective blades, and shims 35 are disposed between the blades 31 and 32 and the upper clamping plate 30.

The lower longitudinal frame member 11 has a lower clamping plate 37 on which a fixed blade 38 is similarly secured for the cutting of flat bar stock, and a fixed blade 39 for the cutting of angle stock, the blades 38 and 39 co-operating with the blades 31 and 32 respectively.

An air valve 42 is mounted on a longitudinally extending mounting bar 43, the air valve 42 being operable by means of the lever arm 44. Return of working parts is.

effected by a tension spring 45. The mounting bar 43 carries on it a pair of adjustable steadies 47, and these are effective in preventing upward displacement of a bar or angle when being cut.

On the other side of the guillotine from the steadies and secured to the lever arm 18 is a depending bracket which supports an outwardly extending rod 51 on which is slidably .and retainably movable a sleeve .52, the sleeve.

52 carrying on it a clamping screw 53, and also a stop bracket 54 which can be positioned either in alignment with the angle cutting blades or with the bar stock cutting blades whereby an angle or a bar may be urged against the stop bracket to gauge the length of the cut portion. When, however, the guillotine is operated, the blade arm 25 moves downwardly as the lever arm 18 moves upwardly rearwardly of the front forks, that is, as the stop bracket 54 moves upwardly, and away from the metal being cut, so that jamming of the metal between the guillotine blades and the stop bracket is substantially eliminated. This is of great importance when angle is being cut, as the end of the angle contiguous with the stop bracket cannot rotate relative to the stop bracket without this jamming occurring. It is also of course useful in the cutting of flat bar stock.

It frequently happens that a machine is required for the bending of bars or the like, and so that this machine can be used for this purpose in addition to being used as a guillotine, the lower longitudinal frame member 11 has a vertical extension 57 thereon which can receive a tool, and a co-operating tool can be fixed to the forwardly projecting end 58 of the blade arm 25. Such tools are not however, illustrated in the drawings.

FIG. 4 illustrates a simple non-return valve 60 in the path of air flow from the non-operative side of the piston and the movable resilient disc 61 which closes apertures in a plate 62, prevents air flow upon sudden movement of the piston in the cylinder, this providing air cushioning means.

What I claim is:

1. An air powered angle and bar guillotine comprising a frame, a lower longitudinal member on the frame, a pair of parallel spaced front forks extending upwardly from near the front end of the lower longitudinal member, .a pair of parallel spaced rear forks extending upwardly from near the rear end of the lower longitudinal member, a blade arm hinged at its rear end between the rear forks, a lever arm disposed .above the blade arm and hinged between the front forks, the front ends of both blade and lever arms extending forwardly of the front forks, links joining said front ends, an air cylinder trunnion member, and a fixed bar guillotine blade and a fixedangle guillotine blade both clamped to the lower clamping plate and co-operating with respective moving blades.

2. An air powered angle and bar guillotine comprising a frame, a lower longitudinal member on the frame, a pair of parallel spaced front forks extending upwardly from near the front end of the lower longitudinal mem-- her, a pair of parallel spaced rear forks extending upwardly from near the rear end of the lower longitudinal member, a blade arm hinged at its rear end between the rear forks, a lever arm disposed above the blade arm and hinged between the front forks, the front ends of both blade and lever arms extending forw-ardly'of thefront forks, linhs joining .said front ends, an. air cylinder trunnion mounted on the frame rearwardly of the blade.

arm, the piston rod of the air cylinder pivotally connected to the rear end of the lever arm, an upper clamping plate on the blade arm, a moving bar guillotine blade, and a moving angle guillotine blade both clamped to the upper clamping plate, a lower clamping plate on the longitudinal member, a fixed bar guillotine blade and a fixed guillotine blade both clamped to the lower clamping plate and cooperating with respective moving blades, a mounting bar on one side of the frame, and a pair of adjustable steadies depending from the mounting bar.

3. An air powered angle and bar guillotine comprising a frame, a lower longitudinal member on the frame, a pair of parallel spaced front forks extending upwardly from near the front end of the lower longitudinal member, a pair of parallel spaced rear forks extending upwardly from near the rear end of the lower longitudinal member, a blade arm hinged at its rear end between the rear forks, a lever arm disposed above the blade arm and hinged between the front forks, the frontends of both blade and lever arms extending forwardly of the front forks, links joining said front ends, an air cylinder trunnion mounted on the frame rearwardly of the blade arm, an air cushion within the air cylinder consisting of a spring loaded disc valve in an end plate thereof, the piston rod of the air cylinder pivotally connected to the rear end of the lever arm, a return spring between the blade arm and the frontforks, an upper clamping plate on the blade arm, a moving bar guillotine blade, and a moving angle guillotine blade both clamped to the upper clamping plate, a lower clamping plate on the longitudinal member, a fixed bar guillotine blade and a fixed angle guillotine blade both clamped to the lower clamping plate and co-operating with respective moving blades.

4. An air powered angle and bar guillotine comprising a frame, a lower longitudinal member on the frame, a pair of parallel spaced front: forks extending upwardly from near the front endof the lower longitudinal member, a pair of parallel spaced-rear forks extending upwardly from near the rear end of the lower longitudinal member, forward and rear extensions on the lower longitudinal member, .a blade arm hinged at its rear end between the rear forks, a lever arm disposed above the blade arm and hinged between the front forks, the front ends of both blade and lever arms extending forwardly of the front forks, links joining said front ends, an air cylinder trunnion mounted on the rear extension of the lower longitudinal. member rearwardly of the blade arm, an air cushionon the air cylinder, the piston rod of the air cylinder pivotally connected to the rear end of the lever arm, a return spring between the blade arm and the front forks, an upper clamping plate on the blade arm, a moving bar guillotine blade, and a moving angle guillotine blade both clamped to the upper clamping plate, a lower clamping plate on the longitudinal membena fixed bar guillotine blade and a fixed angle guillotine blade both clamped to the lower clamping plate and co-operating with respective moving blades, a mounting bar on the frame on one sidefof the guillotine, a pair of adjustable steadies depending from the mounting bar, and an adjustable stop depending, from the lever arm on the other sideof the guillotine.

References Cited by the Examiner UNITED STATES PATENTS 348,731 9/86 Gargrave 83589 557,103 3/96 Bertsch 83606 650,193. 5/00 Rouse 83-395 657,272 9/00 Lord 83605 1,833,216. 11/31 Hanna 12ll32 2,337,206 12/43 Nebel 83-447 2,436,806 3/48 Hunt 83387 3,004,458 10/61 Dvorak 83-589 ANDREW R. J-UHASZ, Primary Examiner.

CARL W. TOMLIN, WILLIAM W; DYER, 1a.,

Examiners. 

1. AN AIR POWERED ANGLE AND BAR GUILLOTINE COMPRISING A FRAME, A LOWER LONGITUDINAL MEMBER ON THE FRAME, A PAIR OF PARALLEL SPACED FRONT FORKS EXTENDING UPWARDLY FROM NEAR THE FRONT END OF THE LOWR LONGITUDINAL MEMBER, A PAIR OF PARALLEL SPACED REAR FORKS EXTENDING UPWARDLY FROM NEAR THE REAR END OF THE LOWER LONGITUDINAL MEMBER, A BLADE ARM HINGED AT ITS REAR END BETWEEN THE REAR FORKS, A LEVER ARM DISPOSED ABOVE THE BLADE ARM AND HINGED BETWEEN THE FRONT FORKS, THE FRONT ENDS OF BOTH BLADE AND LEVER ARMS EXTENDING FORWARDLY OF THE FRONT FORKS, LINKS JOINING SAID FRONT ENDS, AN AIR CYLINDER TRUNNION MOUNTED ON THE FRAME REARWARDLY OF TE BLADE ARM, THE PISTON ROD OF THE AIR CYLINDER PIVOTALLY CONNECTED TO THE REAR END OF TE LEVER ARM, AN UPPER CLAMPING PLATE ON THE BLADE ARM, A MOVING BAR GUILLOTINE BLADE AND A MOVING ANGLE GUILLOTINE BALDE BOTH CLAMPED TO THE UPPER CLAMPING PLATE, A LOWER CLAMPING PLATE ON THE LONGITUDINAL MEMBER, AND A FIXED BAR GUILOTINE BLADE AND A FIXED ANGLE GULILLOTINE BLADE BOTH CLAMPED TO THE LOWER CLAMPING PLATE AND CO-OPERATIG WITH RESPECTIVE MOVING BLADES. 